Three Chicago firefighters were hospitalized for heat-related issues as they fought a fire on the South Side this afternoon, officials said.

The three men were battling the fire at a 2 1/2 story frame structure on the 6900 block of South Ada Street which began at about 1 p.m. and was under control about an hour later, said Quention Curtis, a Chicago Fire Department spokesman.

Two of the firefighters were taken to a hospital in serious-to-critical condition, and another firefighter was taken in fair-to-serious condition, according to Curtis.

Initial information indicates the injuries were heat exhaustion-related and appeared to be non-life-threatening, according to media affairs.